If you want to perform adjustments for your Suzuki GX 125 then it will always be a good idea to own a Workshop Manual to keep just for reference in the event you need to know how you can remove a certain part like the Wheel Bearing and match it again safely.
Suzuki GX 125 Workshop Manuals offers you identifiable diagnostic guidelines on your vehicle therefore if something is faulty it can help you find out what the problem is and ways to correct it. After that you can assess if this can be done by yourself or in the event the job is just too big it is possible to make a booking for your GX 125 in with a decent mechanic.
Suzuki GX 125 manual